Dental separating-disk.



PATBNTED FEB. 28, 1905.

R. H. HULL.

DENTAL SEPARATING DISK.

APPLIOATION I ILBD FEB.13,1904.

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ifniirnn fares Patented February 28, 1905.

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ROSCOE H. HULL, OF WVORCESTER, A lASSACHUSElTlS, ASSN-:NOR OF ONE-HALF TO ARTHUR B. CHAPIN, OF \VORUESVITER, l\ l'ASc A- DENTAL SEPARATING DISK.

:SIPECIFIGATION forming part of Letters Patent No. 783,959, dated Fe'bruarv 28, 1905.

Application filed February 13, 190 1. SeriaiN0.193,l25.

To mil whom it may eon/1107 12 Be it known thatl, Roscoe H. HULL, a citizen of the United States, residing at Worces ter, in the county of Worcester and State of Massachusetts, have invented a new and usef u]. Improvement in Dental Separating-Disks, of which the following, together With the accompanying drawings, is a specification sufliciently full, clear, andexact to enable persons skilled in the art to which this invention appertains to make and use the same.

This invention relates to an improved construction for small grinding or abrasive disks adapted for use in dental practice for separating teeth and for shaping the same.

Single-faced grinding-disks have heretofore been made with a bod y-disk of metal, paper, or similar non-abrasive material having aflixed to one side thereof a surfacing of granular abrasive substance the particles of which are attached to the surface of said body-disk by an adhesive glue or sticking cement. in such disks, however, the edges do not have eflicient or enduring cutting capacity, since in those having a hard or metal body the abrasive particles on the edge are soon lost and the rim of metal interferes with any further abrasive action by the edge, while in the case of those having a body-disk of paper or the like the fabric will not properly hold the abrasive particles but softens and pulps up, allowing the abrasive particles to escape and resulting in quick destruction of the edge portions and all capacity for abrasive action at the edges.

The object of my present invention is to obviate these objections and to provide a dental separating-disk composed of concreted abrasi re and combining materials integral throughout and having one of its side surfaces rough or abrasive and one of its side surfaces made smooth-filled or level-coated, with a moderately-wearable protective facing that renders that side of the disk non-abrasive, While affording or insuring full cutting capacity at the edge and the durable and uniform Wearing of the abrasive and protective substances at the peripheral edge.

Another object is to provide a concrete dental disk composed of abrasive material and an integrating or cementing substance and having one smooth side surface and one rough or abrading side surface and an integral central projecting hub upon the abrading side of the disk.

attain these objects by the improved article of manufacture more fully hereinafter explained, and illustrated in the drawings, wherein-- Figure 1 represents an edgewise view of my improved dental separatingdisk as applied to use. Fig. 2 represents the abrasive side face of the disk. 3 represents the non-abrasive or smooth side face of the disk, and Fig. 4L represents an enlarged cross-section of the disk.

My invention consists in a dental sermratingdisk composed of eonereted granular abrasive material throughout its mass and having one side face coated or filled up to an oven smooth surface with a moderately-wearable integrating material, as vul rubber or other suitable semihard subs ance,as spccilied,thereby providing a wholly concrete dental disk with a smooth non-abrasive surface upon one side and producing a disk that will cut at its peripheral edge and at one of its side faces with uniform eliiciency until the disk is worn out by diminution of its diameter.

This improved disk preferably made of a compound consisting of comminuted carborundum or other suitable abrasive grit material, togetherwith an integrating medium of primary plastic or mix-able nature and capable of hardening in homogeneous mass to the desired degree, as \ullcanizable rubber or a suitable substance that will securely hold the abrasive particles, but will itself wear away as the particles wear away in the use of the disk. The disk A primarily molded into shape from the compound while in a plastic or unsolidilied condition, and its concrete substance is normally abrasive through its interior and rough on the exterior surfaces. The side sru'face 2 and edge 3 are left in their abrasive form, while the reverse side surface is further coated or lilled up with the integrating medium or modcrately-wearable nonabrasive substance alone or without grit, producing the plain smooth side surface 5. The composition of the disk is then solidified by vulcanization or well-known treatment for hardening materials of this nature. The disk is preferably formed with an integral boss or hub 6 projecting from the abrasive side face 2 around the central eye or opening 7, which receives the axle 9, on which the disk is mounted for use.

The smooth filling of the side 5 may in some instances be applied after the primary hardening or vulcanization of the grit composition in the molded disk and a rehardening treatment for the coating subsequently applied thereto.

By my invention herein shown and described I produce a solid dental separating abrasive disk of homogeneous abrasive character throughout, but presenting one abrasive side face 2 and one smooth or non-abrasive side face 5 and an abrasive edge 3, that will offer good cutting qualities for the full width of the edge, and while the disk decreases in diameter by the wear, such wear being not unduly rapid nor withstanding longer than the normal dcterioration of the granular abrasive particles, this device is very eflicient for cutting space between a sound tooth on and defective tooth it without injury to the enamel of the sound tooth.

W hat I claim as my invention, and desire to secure by Letters Patent, is

l. A homogeneous vulcanized dental separating-disk, composed of concreted granular abrasive material throughout its mass, and having a side surface rendered smooth and non-abrasive by a surface-filling of moderately-wearable non-abrasive substance, integrated therewith, substantially as set forth.

2. As a new article of manufacture, a dental separating-disk composed throughout of a homogeneous concrete of granular abrasive material and an integrating medium, and having one side face evened or lilled up to a plain smooth surface with a moderately-wearable semihard substance, as vulcanized rubber, said disk presenting a smooth non-abrasive surface on one side, a cutting peripheral edge, and an abrasive surface on its other side, and having a projecting central boss or hub disposed wholly upon the abrading side of the disk.

3. A dental separating disk composed throughout of granulated abrasive material and an integrating substance, and having the granules on one side of the disk completely involved and the surface made smooth and non-abrasive by a filling of said integrating substance, while its opposite side and periph eral edge presents a granular abrasive surface.

l Vitness my hand this 11th day of February, 1904.

ROSCOE H. HULL.

Witnesses:

CHAS. H. BURLEIGH, ELLA P. BLENUS. 

